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In this paper, a 24-40 GHz broadband millimeter-wave (mmWave) down-conversion doublebalanced mixer with a dual-band local oscillator (LO) buffer employing RF and IF coupled resonators is presented for 5G new radio (NR) frequency range 2 (FR2) cellular applications. The proposed mixer comprises a transformer-coupled gm-boosted common-gate (CG) Gm-stage, a single-to-differential currentto-current RF capacitor-tuned coupled resonator, active switching stages with dual-band three-stage LO buffers, a current-to-voltage IF coupled resonator with gain equalization, and a wideband IF buffer with a transformer-based balun. The transformer-coupled gm-boosted CG Gm-stage improves the NF and provides broadband input power matching. RF and IF coupled resonators enable an RF operating frequency range of 24-40 GHz and IF 1 dB bandwidth of more than 0.8 GHz, respectively. The implemented mixer was fabricated using a 40 nm CMOS process and characterized primarily in the 5G NR FR2 bands. The active die area was 0.654 mm 2 , and the mixer drew a bias current of 16 mA from a nominal supply voltage of 1.1 V. The mixer exhibited an RF operating frequency range of 24-40 GHz, noise figure of 12.4 dB, conversion gain of 1.2 dB, IF 1 dB bandwidth of 1.1 GHz, and output-referred third-order intercept point of 6.8 dBm.INDEX TERMS 5G, broadband, capacitor-tuned, cellular, coupled resonator, frequency range 2 (FR2), down-conversion mixer, dual-band, gain equalization, gm-boosted, LO buffer, millimeter-wave (mmWave), new radio (NR)

In this paper, a 2.4 GHz Bluetooth low energy receiver employing a power-efficient quadrature RF-to-baseband-current-reuse architecture is presented for low-power low-voltage internet of things applications. The proposed quadrature RF-to-baseband-current-reuse RF front-end consists of a lownoise transconductance amplifier, an active-type polyphase filter-based quadrature generator, transimpedance amplifiers, and double-balanced current-mode passive mixers on a single dc current path. An input matching network is used to perform power-constrained simultaneous noise and input power matching and 1/f noise reduction in the RF and baseband domains, respectively. The quadrature RF signals are provided to the single-quadrature mixers through an embedded active-type polyphase filter-based quadrature generator. The implemented Bluetooth low energy receiver is composed of the RF-to-basebandcurrent-reuse RF front-end, IF amplifiers, two-stage passive-RC polyphase filter, and fifth-order Chebyshev-II G m -C filters. The proposed design was fabricated using a 65-nm CMOS process and characterized primarily in the Bluetooth low energy operating frequency bands. The active die area of the implemented receiver was 0.85 mm 2 , and the receiver drew a bias current of 1.41 mA from a nominal supply voltage of 0.8 V. The Bluetooth low energy receiver achieved a noise figure of 13.2 dB, conversion gain of 42 dB, image rejection ratio of more than 30 dB, and input-referred third-order intercept point of −25 dBm.INDEX TERMS Active-type polyphase filter, bias-current sharing, Bluetooth low energy, current-reuse, image rejection ratio, IoT, I/Q mismatch, low-IF receiver, low-voltage, non-invasive filter, quadrature generator, quadrature transconductor, RF-to-BB-current-reuse